<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <h1>{{res}}</h1>
        <br>
        <button @click="rev">逆转世界</button>
    </div>
    <script src="./vue.js"></script>
    <script>
new Vue({
    el:'#app',
    data:{
      res:'Hello,World',
      flag:true
    },
    methods:{
        rev(){
   
        this.res=this.res.split('').reverse().join('')
        //   console.log(this.res.split('').reverse().join(''));
        }
    }
})


    </script>
</body>
</html>